RE: [Xen-users] using HYPERVISOR_console_io

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I'm porting a kernel from 2.0.7 to 3.0 and need to do some 
> low level debugging.
> 
> It's unclear to me what need's to be done to get 
> HYPERVISOR_console_io to work.
> I've compiled xen with debug=y. My simple kernel is as follows.
> 
> void start_kernel( start_info_t *start_info ) {
>         char *message = "hello\n";
> 
>         HYPERVISOR_console_io(CONSOLEIO_write, 
> strlen(message), message); }
> 
> I'm fairly confident that I'm entering start_kernel because I 
> can change the behavior by putting a while(1) after the 
> HYPERVISOR call.
> 
> Where should I see the output if things are working? I don't 
> see anything on the PC's monitor.

Have you got a serial console set up? It's pretty useful to have xen
debug output interspersed with domain output when debugging, plus the
'xen magic keys' are useful too.
 
> How do I view the boot messages for xen? IIRC I used xm under 
> 2.0.7 but I don't see any options with 3.0.

'xm dmesg' should also show you output.

Ian

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